Certified sec. standard reference buffer solution

Description

• General description: The potassium tetraoxalate dihydrate certified secondary standard reference buffer solution is gravimetrically prepared using high-quality salt in high-purity water. Its pH value is measured by differential potentiometry with two platinum hydrogen electrodes against primary certified reference materials from NIST & PTB. The pH qualification is based on the 5-point calibration method, following DIN 19268, against certified primary reference standards as per DIN 19266.Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
• Application: It can be used to calibrate, qualify, and monitor pH measuring instruments and as a control for testing other buffer solutions.
• Features and Benefits: Available in a safe 100 mL high-density plastic bottle in solution formatSubjected to detailed stability studies as per ISO Guide 35 Product label carrying relevant information on order number, article description, lot number, expiry date and safety data, in accordance with ISO Guide 31Accompanied with a detailed and batch-specific certificate of analysis (CoA) for an effective quality management systemMeasured and qualified in ISO/IEC 17025 and ISO 17034 accredited laboratoryTraceable to SRMs from NIST and primary certified reference standards from PTB
• Analysis Note: pH-value: 1.674 - 1.683For complete data see the enclosed certificate
• Legal Information: CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany